Disc drive for adaptively controlling recording speed and method for the same

ABSTRACT

A method and apparatus for correcting a tilt without repeatedly calculating a tilt angle with respect to a corresponding recording or reproducing sector, by managing the tilt angle detected with respect to each recording sector of a disc in a disc drive. If a tilt of a disc mounted in the disc drive is detected, a memory is searched for a tilt angle for a sector of the disc in which the tilt is detected. If no tilt angle is found in the memory, a tilt angle is calculated for the sector based on the detected tilt of the disc, the tilt of the disc is corrected, and the calculated tilt angle stored in the memory to be used for the sector. If a tilt angle is found in the memory, the tilt of the sector is corrected using the found tilt angle.

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims the benefit of Korean Patent ApplicationNo. 2002-54027, filed on Sep. 7, 2002, in the Korean IntellectualProperty Office, the disclosure of which is incorporated herein byreference.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a disc drive for adaptivelycontrolling a recording speed, and more particularly to, a disc drivefor adaptively controlling a recording speed according to a transmissionspeed of a received signal and a method for the same.

[0004] 2. Description of the Related Art

[0005] A disc drive records data on a disc or reproduces data from thedisc. When a received signal is recorded, a conventional disc driverecords the received signal on the disc at a predetermined speedregardless of a transmission speed of the received signal. However, atransmission speed of a signal outputted from a channel receiver such asa set top box is not constant. This is because the transmission speed ofdata can be varied by an information provider or a program which isprovided to the set top box.

[0006] Thus, the transmission speed of the signal outputted from thechannel receiver may be different from the recording speed of the discdrive. If so, the disc drive cannot normally record the signal outputtedfrom the channel receiver.

[0007] In the conventional art, a medium is additionally connectedbetween the channel receiver and the disc drive so as to record thesignal outputted from the channel receiver on the disc loaded in thedisc drive. The medium interfaces the transmission speed of the signaloutputted from the channel receiver with the recording speed of the discdrive. A personal computer or a high capacity memory such as a hard diskmay be used as the medium.

[0008] In the conventional art, since the medium must be additionallyconnected between the channel receiver and the disc drive, anenvironment setting task becomes complicated. In addition, atransmission error such as a buffer underrun can occur because thesignal outputted from the channel receiver is stored in the medium andthen is transmitted to the disc drive. If the transmission error such asthe buffer underrun occurs, data transmitted to the disc drive may bedamaged.

SUMMARY OF THE INVENTION

[0009] Accordingly, it is an aspect of the present invention to providea disc drive which controls a recording speed to adapt to a transmissionspeed of a signal outputted from a channel receiver and a method for thesame

[0010] It is another aspect of the present invention to provide a discdrive which controls a recording speed, thereby normally recording asignal outputted from a channel receiver on a disc without an additionalmedium between the channel receiver and the disc drive, and a method forthe same.

[0011] It is another aspect of the present invention to provide a discdrive which controls a recording speed while controlling a rotationspeed of a spindle motor to adapt to a transmission speed of receiveddata and a method for the same.

[0012] According to another aspect of the present invention, there isprovided a disc drive, which records data on a disc, comprising a clockgenerator which generates a clock signal that is synchronized with atransmission speed of a received signal, a pickup unit which recordsrecording data corresponding to the received signal on the disc, and arecording processing unit which converts the received signal intorecording data by synchronizing with a clock signal generated from theclock generator into recording data and provides the converted recordingdata to the pickup unit.

[0013] According to an aspect of the present invention, the disc drivefurther comprises a decoder which detects an identifying signal that canbe used to identify the transmission speed of the received signal,provides the detected identifying signal to the clock generator, andtransmits the received signal to the recording processing unit The clockgenerator generates the clock signal that is synchronized with theidentifying signal. The identifying signal can be a periodic signal.

[0014] According to an aspect of the present invention, it, therecording processing unit comprises an encoder which encodes thereceived signal. The clock generator comprises a phase locked loopcircuit. The disc drive includes a spindle motor which rotates the disc,and a spindle motor driving unit which controls a rotation speed of thespindle motor by using the clock signal generated from the clockgenerator.

[0015] According to another aspect of the present invention, there isprovided a disc drive which records data on a disc comprising a pickupunit which records recording data corresponding to a received signal onthe disc, and a recording processing unit which converts the receivedsignal into recording data by synchronizing with a transmission speed ofthe received signal and provides the recording data to the pickup unit.The disc drive further comprises a decoder, which detects an identifyingsignal that can be used to determine the transmission speed of thereceived signal and transmits the identifying signal to the recordingprocessing unit.

[0016] According to yet another aspect of the present invention, thereis provided a method of controlling a recording speed of a disc drivecapable of recording data on a disc comprising generating a clock signalthat is synchronized with a transmission speed of a received signal,converting the received signal into recording data that is to berecorded on the disc by synchronizing with the clock signal, andrecording the converted recording data on the disc.

[0017] Generating the clock signal includes detecting an identifyingsignal capable of recognizing the transmission speed of the receivedsignal, and generating a clock signal that is synchronized with theidentifying signal. The method further comprises controlling a rotationspeed of the spindle motor that rotates the disc by synchronizing withthe clock signal.

[0018] Additional aspects and advantages of the invention will be setforth in part in the description which follows and, in part, will beobvious from the description, or may be learned by practice of theinvention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] These and/or other aspects and advantages of the invention willbecome apparent and more readily appreciated from the followingdescription of the preferred embodiments, taken in conjunction with theaccompanying drawings in which:

[0020]FIG. 1 is a block diagram of a disc drive which adaptivelycontrols a recording speed according to an embodiment of the presentinvention; and

[0021]FIG. 2 is a flowchart showing a method of controlling a recordingspeed of a disc drive according to an embodiment of the presentinvention.

DETAILED DESCRIPTION OF THE INVENTION

[0022] Reference will now be made in detail to the present preferredembodiments of the present invention, examples of which are illustratedin the accompanying drawings, wherein like reference numerals refer tothe like elements throughout. The embodiments are described below inorder to explain the present invention by referring to the figures.

[0023]FIG. 1 is a block diagram of a disc drive which adaptivelycontrols a recording speed according to an embodiment of the presentinvention. Referring to FIG. 1, a disc drive according to the presentinvention includes a disc 101, a pickup unit 102, a decoder 103, arecording processing unit 104, a clock generator 107, a spindle motordriving unit 108, and a spindle motor 109. The recording processing unit104 includes a recording pulse generator 106 and an encoder 105.

[0024] The disc 101 is a medium such as CD or DVD, in which data can berecorded.

[0025] The pickup unit 102 picks up data recorded from the disc 101 byusing a laser diode (not shown) and outputs a radio frequency signalthat is converted into an electrical signal emitted as light to recorddata on the disc 101.

[0026] The decoder 103 decodes a received signal. The received signal isprovided by a channel receiver such as a set top box or the like. Thedecoder 103 detects an identifying signal from received signals. Theidentifying signal, as a periodic signal, indicates a transmission speedof the received signals. For example, the identifying signal may be asynchronizing signal or any other predetermined signal.

[0027] For example, if a synchronizing signal is the identifying signal,the decoder 103 detects the synchronizing signal included in thereceived signals as the identifying signal. If a periodic signal otherthan the synchronizing signal is the identifying signal, the decoder 103detects the periodic signal included in the received signals as theidentifying signal. The identifying signal can be determined when asystem is manufactured.

[0028] The decoder 103 transmits the detected identifying signal to theclock generator 107 and transmits the received signals other than theidentifying signal to the recording processing unit 104.

[0029] The recording processing unit 104 converts the signal transmittedfrom the decoder 103 into recording data which can be recognized by thepickup unit 102. Thus, the recording processing unit 104 includes theencoder 105 and the recording pulse generator 106.

[0030] The encoder 105 converts the signal transmitted from the decoder103 into recording data. A conversion method of the encoder 105 can beone of conventional methods. Here, the encoder 105 encodes the data bysynchronizing with a clock signal generated from the clock generator107. Thus, the recording data outputted from the encoder 105 have aperiod that is synchronized with the clock signal generated from theclock generator 107.

[0031] The recording pulse generator 106 generates a recording pulsecorresponding to the recording data transmitted from the encoder 105.Then, the generated recording pulse is transmitted to the pickup unit102. Thus, the pickup unit 102 records data on the disc 101 according tothe generated recording pulse that is synchronized with a transmissionspeed of the received signal.

[0032] The clock generator 107 generates a clock signal that issynchronized with the identifying signal transmitted from the decoder103. The clock signal is used to control a recording speed of the discdrive. The clock generator 107 can be a phase locked loop (PLL) circuit.The clock signal generated from the clock generator 107 is provided tothe encoder 105 and the spindle motor driving unit 108.

[0033] The spindle motor driving unit 108 controls a rotation speed ofthe spindle motor 109 by using the clock signal generated from the clockgenerator 107 as an operation clock signal. The spindle motor 109 isdriven by the spindle motor driving unit 109 and rotates the disc 101.

[0034] In this example embodiment, the clock generator 107 is outsidethe encoder 105. However, the clock generator 107 may be included insidethe encoder 105. In this case, the encoder 105 generates a clock signalaccording to the identifying signal received from the decoder 103 andencodes a signal by synchronizing with the generated clock signalreceived from the decoder 103.

[0035]FIG. 2 is a flowchart showing a method of controlling a recordingspeed of a disc drive according to an embodiment of the presentinvention.

[0036] First, it is determined whether a signal to be recorded on a discis received from a channel receiver or the like (operation 201).

[0037] If it is determined that the signal is received in operation 201,an identifying signal among the received signals is detected (operation202). The identifying signal to be detected can be a predeterminedsignal. For example, if a synchronizing signal is predetermined as theidentifying signal, the synchronizing signal included in the receivedsignals is detected as the identifying signal in operation 202.

[0038] A clock signal that is synchronized with the detected identifyingsignal is generated (operation 203). A method of generating the clocksignal is previously described with reference to the clock signal 107 ofFIG. 1.

[0039] A received signal which is synchronized with the generated clocksignal is encoded and recorded, and a rotation speed of the spindlemotor 109 is controlled by using the clock signal.

[0040] As described above, the disc drive according to one aspect of thepresent invention controls a recording speed of data and a rotationspeed of a spindle motor to adapt to a transmission speed of receiveddata, thereby normally recording data received from a channel receiveron a disc without connecting an additional medium between the channelreceiver and the disc drive. In addition, any additional tasks requiredto provide the medium are not necessary, and transmission errors such asa buffer underrun can be prevented from occurring.

[0041] According to other aspects of the invention, the recordingprocessor 104 or other component is a computer implementing the methodshown in FIG. 2 using data encoded on a computer readable medium.

[0042] Although a few preferred embodiments of the present inventionhave been shown and described, it would be appreciated by those skilledin the art that changes may be made in these embodiments withoutdeparting from the principles and spirit of the invention, the scope ofwhich is defined in the claims and their equivalents.

What is claimed is:
 1. A disc drive which records data on a disc, thedisc drive comprising: a clock generator which generates a clock signalthat is synchronized with a transmission speed of a received signal; apickup unit which records recording data corresponding to the receivedsignal on the disc; and a recording processing unit which converts thereceived signal into the recording data by synchronizing with a clocksignal generated from the clock generator into recording data andprovides the converted recording data to the pickup unit.
 2. The discdrive of claim 1, wherein the disc drive further comprises a decoderwhich detects an identifying signal indicating a transmission speed ofthe received signal, provides the detected identifying signal to theclock generator, transmits the received signal to the recordingprocessing unit, and the clock generator generates the clock signal thatis synchronized with the identifying signal.
 3. The disc drive of claim2, wherein the identifying signal is a periodic signal.
 4. The discdrive of claim 1, wherein the recording processing unit comprises anencoder which encodes the received signal.
 5. The disc drive of claim 1,wherein the clock generator comprises a phase locked loop circuit. 6.The disc drive of claim 1, wherein the disc drive further comprises: aspindle motor which rotates the disc; and a spindle motor driving unitwhich controls a rotation speed of the spindle motor by using the clocksignal generated from the clock generator.
 7. The disc drive of claim 2,wherein the disc drive further comprises: a spindle motor which rotatesthe disc; and a spindle motor driving unit which controls a rotationspeed of the spindle motor by using the clock signal generated from theclock generator.
 8. The disc drive according to claim 1, wherein thereceived signal is from a channel receiver without an additional mediumbetween the channel receiver and the disc drive.
 9. A disc drive whichrecords data on a disc, the disc drive comprising: a pickup unit whichrecords recording data corresponding to a received signal on the disc;and a recording processing unit which converts the received signal intothe recording data by synchronizing with a transmission speed of thereceived signal and provides the recording data to the pickup unit. 10.The disc drive of claim 9, wherein the disc drive further comprises adecoder which detects an identifying signal capable of indicating thetransmission speed of the received signal and transmits the identifyingsignal to the recording processing unit.
 11. The disc drive of claim 10,wherein the identifying signal is a periodic signal.
 12. The disc driveof claim 10, wherein the disc drive further comprises: a spindle motorwhich rotates the disc; and a spindle motor driving unit which controlsa rotation speed of the spindle motor by synchronizing with theidentifying signal.
 13. The disc drive of claim 11, wherein the discdrive further comprises: a spindle motor which rotates the disc; and aspindle motor driving unit which controls a rotation speed of thespindle motor by synchronizing with the identifying signal.
 14. The discdrive according to claim 9, wherein the received signal is from achannel receiver without an additional medium between the channelreceiver and the disc drive.
 15. A method of controlling a recordingspeed of a disc drive capable of recording data on a disc, comprising:generating a clock signal that is synchronized with a transmission speedof a received signal; converting the received signal into recording datathat is to be recorded on the disc by synchronizing with the clocksignal; and recording the converted recording data on the disc.
 16. Themethod of claim 15, wherein the generating the clock signal comprises:detecting an identifying signal capable of indicating the transmissionspeed of the received signal; and generating a clock signal that issynchronized with the identifying signal.
 17. The method of claim 16,wherein the identifying signal is a periodic signal.
 18. The method ofclaim 15, further comprising: controlling a rotation speed of thespindle motor that rotates the disc by synchronizing with the clocksignal.
 19. The method according to claim 15, wherein the receivedsignal is from a channel receiver without an additional medium betweenthe channel receiver and the disc drive.
 20. A computer readable mediumencoded with processing instructions implementing a method ofcontrolling a recording speed in a disc drive, the method comprising:generating a clock signal that is synchronized with a transmission speedof a received signal; converting the received signal into recording datathat is to be recorded on the disc by synchronizing with the clocksignal; and recording the converted recording data on the disc.
 21. Thecomputer readable medium according to claim 20, wherein the generatingthe clock signal comprises: detecting an identifying signal capable ofrecognizing the transmission speed of the received signal; andgenerating a clock signal that is synchronized with the identifyingsignal.
 22. The computer readable medium according to claim 20, whereinsaid method further comprises: controlling a rotation speed of thespindle motor that rotates the disc by synchronizing with the clocksignal.
 23. A method of controlling a speed of a disc drive, comprising:transmitting an identifying signal of a transmission speed of an othertransmitted signal; receiving the identifying signal and the othertransmitted signal; and generating a clock signal synchronized with thetransmission speed of the other transmitted signal.
 24. A method ofcontrolling a speed of a disc drive according to claim 23, furthercomprising: converting the other transmitted signal into datasynchronized with the clock signal.
 25. An apparatus for controlling aspeed of a disc drive, comprising: a transmitter to transmit anidentifying signal and an other transmitted signal, wherein theidentifying signal identifies a transmission speed of the othertransmitted signal; a receiver to receive the identifying signal and theother transmitted signal; and a generator to generate a clock signalsynchronized with the transmission speed of the other transmittedsignal,
 26. An apparatus for controlling a speed of a disc driveaccording to claim 25, further including a converter to convert theother transmitted signal into data synchronized with the clock signal.27. A computer readable medium encoded with processing instructions forimplementing a method of controlling a recording speed in a disc drive,the method comprising: transmitting an identifying signal of atransmission speed of an other transmitted signal; receiving theidentifying signal and the other transmitted signal; and generating aclock signal synchronized with the transmission speed of the othertransmitted signal.
 28. The computer readable medium of claim 25,wherein said method further comprises: converting the other transmittedsignal into data synchronized with the clock signal.